Abstract
Balancing soil microbial diversity and abundance is critical
to sustaining soil health, and understanding the dynamics of
soil microbes in a monocropping system can help determine
how continuous monocropping practices induce soil sickness
mediated by microorganisms. This study used previously
constructed gradient continuous monocropping plots and
four varieties with different monocropping responses were
investigated. The feedback responses of their soil fungal communities
to short-term and long-term continuous monocropping
were tracked using high-throughput sequencing techniques.
The analyses indicated that soil samples from 1 and
2 year monocropped plots were grouped into one class, and
samples from the 11 and 12 year plots were grouped into another,
regardless of variety. At the species level, the F. solani,
Fusarium oxysporum, Neocosmospora striata, Acrophialophora
levis, Aspergillus niger, Aspergillus corrugatus, Thielavia
hyrcaniae, Emericellopsis minima, and Scedosporium
aurantiacum taxa showed significantly increased abundances
in the long-term monocropping libraries compared to
the short-term cropping libraries. In contrast, Talaromyces
flavus, Talaromyces purpureogenus, Mortierella alpina, Paranamyces
uniporus, and Volutella citrinella decreased in
the long-term monocropping libraries compared to the shortterm
libraries. This study, combined with our previous study,
showed that fungal community structure was significantly
affected by the length of the monocropping period, but peanut
variety and growth stages were less important. The increase
in pathogen abundances and the decrease in beneficial
fungi abundances seem to be the main cause for the yield decline
and poor growth of long-term monocultured peanut.
Simplification of fungal community diversity could also contribute
to peanut soil sickness under long-term monocropping.
Additionally, the different responses of peanut varieties
to monocropping may be related to variations in their
microbial community structure.
Citations
Citations to this article as recorded by

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